Up to 20 million midwest U.S. residents are about to get some significant pre-Thanksgiving snowfall.

Portions of five Midwest states are now under winter storm warnings as 6 to 10 inches of snow are expected across Iowa, northern Illinois, and southern Lower Michigan. Portions of Chicago could see a foot of snow.

Here are the expected snowfall totals by mid-day Sunday (GFS model output courtesy of Weatherbell.com):

Total forecast snowfall by midday Sunday, 22 November 2015 (NWS GFS model).

After the snowstorm passes, temperatures could reach the single digits in northern Illinois on Sunday morning.